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@li-lilingdu-1884
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> library(rtracklayer)
Loading required package: RCurl
Loading required package: bitops
> browserSession("UCSC")->ex1
> str(ex1)
Formal class 'UCSCSession' [package "rtracklayer"] with 3 slots
..@ url : chr "http://genome.ucsc.edu/cgi-bin/"
..@ hguid: num 3.1e+08
..@ views:<environment: 0x05a22d7c="">
> trackNames(ex1)
Error in if (level > 2) stop("Failed to Parse HTML [", line, ":", col,
:
argument is of length zero
> traceback()
14: function (msg, code, domain, line, col, level, filename)
{
if (level > 2)
stop("Failed to Parse HTML [", line, ":", col, "]: ",
msg)
}(character(0), NULL, NULL, NULL, NULL, NULL, NULL)
13: .Call("RS_XML_ParseTree", as.character(file), handlers,
as.logical(ignoreBlanks),
as.logical(replaceEntities), as.logical(asText),
as.logical(trim),
FALSE, FALSE, as.logical(isURL), FALSE,
as.logical(useInternalNodes),
TRUE, FALSE, FALSE, as.character(encoding),
as.logical(useDotNames),
xinclude, error, PACKAGE = "XML")
12: htmlTreeParse(str, asText = TRUE, useInternalNodes = TRUE, error =
htmlErrorHandler)
11: withCallingHandlers(expr, warning = function(w) invokeRestart
("muffleWarning"))
10:
suppressWarnings(htmlTreeParse(str, asText = TRUE, useInternalNodes =
TRUE,
error = htmlErrorHandler))
9: htmlParse(out)
8: httpGet(ucscURL(object, key), .form, ..., cookie =
ucscCookie(object))
7: ucscGet(object, "tracks", form)
6: .local(object, ...)
5: ucscTracks(object)
4: ucscTracks(object)
3: .local(object, ...)
2: trackNames(ex1)
1: trackNames(ex1)
> sessionInfo()
R version 2.9.1 (2009-06-26)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;
LC_CTYPE=English_United States.1252;
LC_MONETARY=English_United States.1252;
LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] rtracklayer_1.4.0 RCurl_0.98-1 bitops_1.0-4.1
loaded via a namespace (and not attached):
[1] Biobase_2.4.1 Biostrings_2.12.7 BSgenome_1.12.3
IRanges_1.2.3
tools_2.9.1 XML_2.5-3
